Title

Require user Authentication with Exchange Server - Outlook (Cat II impact)

Discussion

Exchange Server supports the Kerberos authentication protocol and NTLM for authentication. The Kerberos protocol is the more secure authentication method and is supported on Windows 2000 Server and later versions. NTLM authentication is supported in pre-Windows 2000 environments. By default, Outlook 2007 will attempt to authenticate using the Kerberos authentication protocol. If it cannot (because no Windows 2000 or later domain controllers are available), it will authenticate using NTLM.

Check Content

The policy value for User Configuration -> Administrative Templates -> Microsoft Office Outlook 2007 -> Tools \ Account Settings -> Exchange “Authentication with Exchange Server” will be set to “Enabled (Kerberos/NTLM Password Authentication)”. Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\12.0\Outlook\Security Criteria: If the value AuthenticationService is REG_DWORD = 9, this is not a finding.

Fix Text

The policy value for User Configuration -> Administrative Templates -> Microsoft Office Outlook 2007 -> Tools \ Account Settings -> Exchange “Authentication with Exchange Server” will be set to “Enabled (Kerberos/NTLM Password Authentication)”.

Additional Identifiers

Rule ID: SV-18912r1_rule

Vulnerability ID: V-17734

Group Title:

Expert Comments

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